Kara member Nicole is exiting the group in 2014.
The 21-year-old K-pop star did not renew her contract, which expires in January (14), according to executives at the band's record label, DSP Media.
Fellow member Jiyoung is also contemplating leaving the group to focus on her education when her contract is up next April.
This isn't the first line-up change for the group - in 2008, Kara was a quintet with members Nicole, Gyuri, Seungyeon and Sunghee. Sunghee left the group following pressure from her parents and they subsequently added two new members, Jiyoung and Hara, according to Billboard.com.
Take a look back at October's inaugural event.
The film is expected to continue without Mendes' involvement.